:root{--bg:#f6f8fc;--paper:#fff;--ink:#10203f;--body:#54627a;--blue:#315ef4;--violet:#7048e8;--cyan:#14b8a6;--line:#dce4f1;--navy:#0c1b36;--max:1180px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.65}img{max-width:100%;display:block}a{color:inherit;text-decoration:none}.container{width:min(var(--max),calc(100% - 48px));margin:auto}.narrow{max-width:840px;margin:auto}.notice{padding:8px;background:var(--navy);color:#dfe7fb;text-align:center;font-size:12px;letter-spacing:.05em}.header{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.94);border-bottom:1px solid var(--line);backdrop-filter:blur(12px)}.head{min-height:74px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{font-weight:850;letter-spacing:.03em;font-size:21px}.brand 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